What type of oxygen masks are used on the flight deck?

The full face mask is the correct choice for the type of oxygen masks used on the flight deck because it is designed to provide a complete seal around the face, ensuring that the pilot receives an adequate supply of oxygen in case of cabin pressure loss or other emergencies. These masks cover both the nose and mouth, which is essential for effectiveness, especially during high-stress situations where breathing may need to be controlled or when harmful fumes could be present in the environment.

Full face masks also typically feature integrated communication systems that allow pilots to maintain contact with air traffic control and crew members, enhancing safety and coordination during critical situations. The design prioritizes not only the delivery of oxygen but also the ability to communicate, which is vital in flight operations.

In contrast, other types of masks like single-piece, half face, or disposable masks do not offer the same level of protection or functionality required in high-altitude, high-pressure situations faced on the flight deck. These masks may be suitable for different scenarios or environments but do not meet the specific safety and operational needs of pilots.